We have figured out how to do nuclear fusion now for quite a number of decades. It just requires a lot of heat and pressure. The tricky bit is to make sure the facilities nearby survive the event. This is what we are working on now. The temperatures and pressures required to even start the fusion is so high that no known material know to man can withstand it. And the amount of energy that is produced in the fusion is too high for anything we know how to safely transport away. It is an extremely hard problem to solve.
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